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Financial Instruments and Fair Value Measures - Bases Used to Measure The Approximate Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Liabilities    
Carrying amount of investments in equity securities that do not have readily determinable fair values $ 66 $ 84
Book value    
Liabilities    
Short-term borrowings   3,699
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 3,755 1,609
Long-term debt and finance lease obligations, excluding fair value hedges 63,021 35,468
Total liabilities 66,776 40,776
Estimate of Fair Value Measurement    
Liabilities    
Short-term borrowings   3,693
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 3,760 1,617
Long-term debt and finance lease obligations, excluding fair value hedges 66,651 34,052
Total liabilities 70,411 39,362
Estimate of Fair Value Measurement | Quoted prices in active markets for identical assets (Level 1)    
Liabilities    
Short-term borrowings   0
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 3,753 1,609
Long-term debt and finance lease obligations, excluding fair value hedges 66,631 34,024
Total liabilities 70,384 35,633
Estimate of Fair Value Measurement | Significant other observable inputs (Level 2)    
Liabilities    
Short-term borrowings   3,693
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 7 8
Long-term debt and finance lease obligations, excluding fair value hedges 20 28
Total liabilities 27 3,729
Estimate of Fair Value Measurement | Significant unobservable Inputs (Level 3)    
Liabilities    
Short-term borrowings   0
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 0 0
Long-term debt and finance lease obligations, excluding fair value hedges 0 0
Total liabilities $ 0 $ 0